315811697 has 2 divisors, whose sum is σ = 315811698. Its totient is φ = 315811696.

The previous prime is 315811693. The next prime is 315811723. The reversal of 315811697 is 796118513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 284630641 + 31181056 = 16871^2 + 5584^2 .

It is an emirp because it is prime and its reverse (796118513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315811697 - 2² = 315811693 is a prime.

It is not a weakly prime, because it can be changed into another prime (315811693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157905848 + 157905849.

It is an arithmetic number, because the mean of its divisors is an integer number (157905849).

Almost surely, 2^315811697 is an apocalyptic number.

It is an amenable number.

315811697 is a deficient number, since it is larger than the sum of its proper divisors (1).

315811697 is an equidigital number, since it uses as much as digits as its factorization.

315811697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 41.

The square root of 315811697 is about 17771.0916096902. The cubic root of 315811697 is about 680.9931400756.

The spelling of 315811697 in words is "three hundred fifteen million, eight hundred eleven thousand, six hundred ninety-seven".